The ANT-751 isn't what I'd think of as powerful, for more than one reason. But regardless, it's best attribute it being able to pull in signals from a wider area than say a larger more directional antenna. I'm not sure your situation is able to really use that to your advantage. You have vertical terrain to hurdle, so typically you want more gain, something that a larger antenna would give you. Your chart doesn't consider the trees around you. How's your tree situation: types, heights, distance, etc? The more horizon you can see the better.
If a rotor is acceptable to you, you could use one on any antenna; an all in one antenna/rotor isn't required. Then you could mount something more directional to get the most out of each signal.
Got any neighbors who use an antenna? Could be useful to see what has worked for them.
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